ACKR1 and hydrops fetalis: With the help of SCS, more and more cells have been proven to be potential target cells for HF, such as CD34+ cells,[115] Sca1+ cells,[116] Treg+ and Th17+ T cells.[85] Another study uncovered that active engagement of NCMs by injection of ACKR1+ ECs can preserve cardiac function after injury by regulating the behavior of CMs.[108] These studies confirm that cell‐type‐targeted intervention of HF is effective and feasible.